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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . T A S K _ A T T R I B U T E S --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2014-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 with Ada.Task_Identification;
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37
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38 generic
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39 type Attribute is private;
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40 Initial_Value : Attribute;
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41
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42 package Ada.Task_Attributes is
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43
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44 -- Note that this package will use an efficient implementation with no
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45 -- locks and no extra dynamic memory allocation if Attribute is the size
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46 -- of either Integer or System.Address, and Initial_Value is 0 (null for
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47 -- an access type).
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48
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49 -- Other types and initial values are supported, but will require
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50 -- the use of locking and a level of indirection (meaning extra dynamic
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51 -- memory allocation).
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52
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53 -- The maximum number of task attributes supported by this implementation
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54 -- is determined by the constant System.Parameters.Max_Attribute_Count.
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55 -- If you exceed this number, Storage_Error will be raised during the
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56 -- elaboration of the instantiation of this package.
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57
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58 type Attribute_Handle is access all Attribute;
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59
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60 function Value
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61 (T : Ada.Task_Identification.Task_Id :=
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62 Ada.Task_Identification.Current_Task) return Attribute;
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63 -- Return the value of the corresponding attribute of T. Tasking_Error
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64 -- is raised if T is terminated and Program_Error will be raised if T
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65 -- is Null_Task_Id.
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66
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67 function Reference
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68 (T : Ada.Task_Identification.Task_Id :=
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69 Ada.Task_Identification.Current_Task) return Attribute_Handle;
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70 -- Return an access value that designates the corresponding attribute of
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71 -- T. Tasking_Error is raised if T is terminated and Program_Error will be
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72 -- raised if T is Null_Task_Id.
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73
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74 procedure Set_Value
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75 (Val : Attribute;
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76 T : Ada.Task_Identification.Task_Id :=
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77 Ada.Task_Identification.Current_Task);
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78 -- Finalize the old value of the attribute of T and assign Val to that
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79 -- attribute. Tasking_Error is raised if T is terminated and Program_Error
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80 -- will be raised if T is Null_Task_Id.
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81
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82 procedure Reinitialize
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83 (T : Ada.Task_Identification.Task_Id :=
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84 Ada.Task_Identification.Current_Task);
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85 -- Same as Set_Value (Initial_Value, T). Tasking_Error is raised if T is
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86 -- terminated and Program_Error will be raised if T is Null_Task_Id.
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87
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88 private
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89 pragma Inline (Value);
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90 pragma Inline (Reference);
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91 pragma Inline (Set_Value);
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92 pragma Inline (Reinitialize);
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93 end Ada.Task_Attributes;
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